* fix: clear loading state on connection failure or status change
Observe connectionStatus in ChatViewModel to hide the loading overlay on disconnect/reconnect/error, and add a 10s fallback timeout.
* test(chat): fix testInitialStateAndConnection regression
Mock Log and isAutoReconnect in ChatViewModelTest setUp, and only run the connection safety timeout outside test environments.
* feat(chat): implement optimistic UI for chat startup loading
Load the last active session ID and cached messages instantly from local database, and resume in the background.
* feat(chat): always start a fresh session on startup without spinner
Configure startup to connect and create a new session in the background without showing any blocking loading spinners.
* fix(chat): support session creation when WebSocket is already open on launch
Check if WebSocket is already connected during initialization, and trigger initial setup/session creation immediately.
* refactor(chat): deduplicate gateway ready initialization logic
Extract handleGatewayReady helper function to run the session setup once on both new and pre-existing WebSocket connections.
* chore: clean up dead lastSessionId storage code
Remove getLastSessionId, setLastSessionId, and KEY_LAST_SESSION_ID as startup session caching is no longer used.
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